Caster



FIG. 1 is a perspective view of a caster;

FIG. 2 is a right-side view of the caster in FIG. 1;

FIG. 3 is a left-side view of the caster in FIG. 1;

FIG. 4 is a front view of the caster in FIG. 1;

FIG. 5 is a rear view of the caster in FIG. 1;

FIG. 6 is a top view of the caster in FIG. 1; and,

FIG. 7 is a bottom view of the caster in FIG. 1.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

We claim the ornamental design for a caster, as shown and described. 